P0375
UniversalTiming Reference High Resolution Signal B Malfunction
The engine computer has detected a problem with high-resolution timing reference signal B. This signal helps the engine determine timing or position; if it is unreliable, starting or running may be affected. The code identifies a detected condition, not proof that a particular part has failed.
⚠️ Before You Begin (Safety First)
If the engine stalls, is difficult to control, or runs very roughly, stop in a safe place and arrange diagnosis rather than continuing to drive. If the vehicle runs normally, drive cautiously and have the issue checked soon.
Common Symptoms
- The check-engine light may be on, even if no change in how the vehicle runs is noticeable.
- Starting may take longer or the engine may fail to start if the signal is needed for engine timing or position synchronization.
- The engine may run roughly, misfire, or stall if timing information becomes unreliable.
- Reduced performance may occur if the engine computer cannot use the timing reference signal consistently.
- There may be no noticeable symptoms when the signal problem is intermittent or does not disrupt engine operation.
Common Causes
- A damaged, loose, or corroded connection in the signal B circuit may interrupt or distort the signal.
- Wiring damage or an electrical short may affect the signal, depending on the vehicle's circuit design.
- The component or source that generates signal B may not be producing a reliable signal.
- Electrical interference or a related power, ground, or control-circuit issue may affect signal quality.
- A problem with the signal target or another related engine-control component may be involved, depending on vehicle design.
Diagnostic Steps
- Note whether the engine starts and runs normally, and whether the warning light is steady or flashing; this helps describe the severity to a technician.
- With the engine off and cool, visually check accessible wiring and connectors related to the engine timing reference system for looseness, corrosion, or visible damage. Do not pull on wiring or probe unidentified terminals.
- If a compatible scan tool is available, record the stored codes and any available related data before clearing anything; other codes can help guide diagnosis.
- If the code returns or symptoms are present, arrange professional testing. Signal waveform and circuit checks may require vehicle-specific information and suitable equipment.
When to Call a Professional
A technician can compare scan data with the signal waveform, inspect the relevant wiring and connections, and check the signal source and related engine-control components as applicable. The correct circuit and test procedure depend on the vehicle's model, year, and engine.
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Commonly Asked Questions
Does P0375 prove that a sensor needs replacement?
No. It indicates a malfunction detected in timing reference signal B. Wiring, connections, the signal source, interference, or related components may also be involved.
Can I keep driving with P0375?
It depends on how the vehicle behaves. If it stalls, runs very roughly, or is difficult to control, stop safely and seek assistance. If it runs normally, arrange diagnosis soon and watch for worsening symptoms.
What does “high resolution” mean in this definition?
It describes a timing reference signal intended to provide detailed timing or position information. The exact signal design and component involved depend on the vehicle.
Why might the vehicle have this code without obvious symptoms?
The signal problem may be intermittent or may not be severe enough to affect starting or running noticeably. The warning still warrants diagnosis, since symptoms can change.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.